1. Hafnium a. Mendeleev and Urbain predicted this element, and it was discovered by Bohr. b. It was discovered in1923.
2. Symbol: Hf, Atomic Number: 72, Atomic Mass: 178.49 a. ‘Hafnium’ came from word Hafnia, which is a Latin word that means Copenhagen, which is the capital city of Denmark. Bohr named this element as Hafnium because it was discovered in Copenhagen. The symbol of this element, Hf came from Hafnium.
3. It has 72 Protons, 72electrons, and 107 neutrons.
4. It was found in the Earth, and the Sun’s atmosphere. Hafnium is solid.
5. Physical Facts a. Melting Point: 2,150°C/3902°F/ 2423.15K. b. Boiling Point: 5400°C/9752°F/5673.15K. c. Density: 13.31g/cm3 d. Abundance in the Earth’s crust: 3.3 parts per million by weight, 0.4 parts per million by moles
6. Hafnium is used to make control rods of nuclear weapons, alloys, micro-processors, incandescent lamps, the electrode of plasma cutting, and weapons with X-ray triggering mechanisms.
7. Interesting facts a. 1g of Hafnium can create 50kg of TNT fire force. Using this characteristic, a lot of countries are developing their own hafnium bombs. 50kg of Hafnium can destroy 197684acre. (800km2) b. Chemically, it’s similar to zirconium. c. At high temperature, it reacts with carbon, boron, silicon, sulfur, and nitrogen.
Hafnium
By Junhyeong Park1. Hafnium
a. Mendeleev and Urbain predicted this element, and it was discovered by Bohr.
b. It was discovered in1923.
2. Symbol: Hf, Atomic Number: 72, Atomic Mass: 178.49
a. ‘Hafnium’ came from word Hafnia, which is a Latin word that means Copenhagen, which is the capital city of Denmark. Bohr named this element as Hafnium because it was discovered in Copenhagen. The symbol of this element, Hf came from Hafnium.
3. It has 72 Protons, 72electrons, and 107 neutrons.
4. It was found in the Earth, and the Sun’s atmosphere. Hafnium is solid.
5. Physical Facts
a. Melting Point: 2,150°C/3902°F/ 2423.15K.
b. Boiling Point: 5400°C/9752°F/5673.15K.
c. Density: 13.31g/cm3
d. Abundance in the Earth’s crust: 3.3 parts per million by weight, 0.4 parts per million by moles
6. Hafnium is used to make control rods of nuclear weapons, alloys, micro-processors, incandescent lamps, the electrode of plasma cutting, and weapons with X-ray triggering mechanisms.
7. Interesting facts
a. 1g of Hafnium can create 50kg of TNT fire force. Using this characteristic, a lot of countries are developing their own hafnium bombs. 50kg of Hafnium can destroy 197684acre. (800km2)
b. Chemically, it’s similar to zirconium.
c. At high temperature, it reacts with carbon, boron, silicon, sulfur, and nitrogen.
8. Sources
a. www.chemicool.com
b. periodic.lanl.gov
c. 100.naver.com
d. www.wikipedia.org
e. www.webelements.com
<Hafnium>
<Structure of protons and electrons of Hafnium>
<Uses of Hafnium: Nuclear powerplant, micro processor,
plasma cutting, submarine>